vue3中pinia的使用方法

npm install pinia

import { createApp } from 'vue';
import { createPinia } from 'pinia';
import App from './App.vue';

const pinia = createPinia();
const app = createApp(App);
app.use(pinia);
app.mount('#app');

import { defineStore } from 'pinia';

// 第一个参数是store的唯一ID，第二个参数是一个函数，返回store的配置对象
export const useCounterStore = defineStore('counter', {
  // 类似于Vuex中的state，存储数据
  state: () => {
    return {
      count: 0
    };
  },
  // 类似于Vuex中的getters，用于派生数据
  getters: {
    doubleCount: (state) => {
      return state.count * 2;
    }
  },
  // 类似于Vuex中的actions和mutations的组合，用于修改state
  actions: {
    increment() {
      this.count++;
    },
    decrement() {
      this.count--;
    }
  }
});

<template>
  <div>
    <p>当前计数: {{ counter.count }}</p>
    <p>双倍计数: {{ counter.doubleCount }}</p>
    <button @click="counter.increment()">增加计数</button>
    <button @click="counter.decrement()">减少计数</button>
  </div>
</template>
<script>
import { useCounterStore } from './store.js';

export default {
  setup() {
    const counter = useCounterStore();
    return { counter };
  }
};
</script>

import { useCounterStore } from './store.js';

const counterStore = useCounterStore();
console.log(counterStore.count);
counterStore.increment();